Manufacture of radiator-tubes.



E. & H. BEHRINGER.

MANUFACTURE OF RADIATOR TUBES.

APPLICATION FILED SEPT.12, 1910.

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MANUFACTURE OF RADIATOR-TUBES.

Original application flled April 18', 1910, Serial No. 555,276.

Specification of Letters Patent.

Patented June 11, 1912.

Divided and this application filed September 12, 1910. Serial No. 581,598.

To all whmn-it-may concern:

Be it known that we, Emu. BEHRINGER and HERMAN BEHRINGER, citizens of the United States, and residents of the borough of Brooklyn, in the county of Kings and State of New York, have invented a new and useful Improvement in the Manufacture of Radiator-Tubes, of which the-following is a specification.

The invention hereof has already been application for Letters Patent of the United States, filed on the 13th of April, 1910, Serial No. 555,276, of which the present application is a division.

In our former application we have claimed, generically novel construction of radiator tube which our invention is designed to produce,'taken as an article of manufacture, whereas in this the later application we direct our claims to' the new process or method of making thesame.

Oujr said invention relates particularly to the manufacture of cooling tubes, such as are "embodied in automobile radiators. In order to gain the most advantageous results with: cooling apparatus ofthis class, it is essential, in the first place, to utilize comparativel'y' thin sheet metal in the'construction of the tubes to insure rapid e ualization-of varying temperatures of the iquids,

ases or vapors, flowing therethrough; secondly, the tubes must have a certain measure of strength, stiffness, and rigidity, to resist not alone the normal internal pressure to subjected, but also the strains that are due to the shocks, jarring, and concussions inherent in a rapidly moving vehicle; thirdly, all joints should be perfectly tight; fourthly, the outline of each tube ought to coincide with the most efiective position thereof; and fifthly, it is of paramount importance to provide for economy of manufacture. our invention is especially desi%1ed to secure the results just noted, and, riefiy stated, it conforming the subject matter external sists in making a cooling tube or tubes of out of comparatively thin sheet metal having two series of differently configurated an lar corrugations ofiset relatively to one another and adapted to be the above type,

brought together in parallelism to form the,

tube or tubes, after which the ed es of the metal sheet that project beyondt e corru gations are united to effect a. complete disclosed by us in an and specifically, the

closure for each tube. The internal flow of the fluid passing through the tube is intended to traverse the series of corrugations, while the external flow of the cooling medium would be parallel to them.

We shall now proceed to describe in detail the several steps followed in the practice of our said method or process of manufacture, with reference to the accompanying drawing, which is hereby made a part of this specification, and in which Figure l is a plan or development of a corrugated metal sheet or blank from which a radiator tube can be made in accordance with the principle of our invention; Fig. 2 is a longitudinal section on the line 22 of Fig. 1; Fig. 3 is a side view of the blank folded up and made into a finished tube;

4 is a fragmentary perspective view of the form of tube shown in the preceding view; Fig. 5 is a rear view of a pairof tubes of the same form, showin how the metal is crimped on the back uring the folding operations; Fig. .6 is a sectional plan view of a group of three tubes, the sections whereof, reading from left to right, are respectively taken from the lines aa;, b-b, c-c of Fig. 7 next following; Fig. 7 is a composite view of another group of three tubes, wherein the left hand tube is a section on the line aL-d of Fig. 6, the middle tube a section on the line e.-e thereabove, and the right hand tube a full front view of the corresponding tube in the same figure; Fig. 8 is a side view of a tube of modified form, also made according to our invention; Fig. 9 is a fragmentary perspective view of the modified form of tube shown in Fig, 8; Fig. 10 is a frontview of a pair of tubes having seams ofiset to one side, but also embodying the invention; Fig. 11 is a broken section view of a form of tube made up of separate sheets, by following substantially the same process or method as with the other forms previously mentioned; and Fig. 12 is afragmentary side view ofthe of tube last named.

' In preparing the sheet metal to manufac hire one .or more of the cooling tubes, the first step naturally is to out the metal "in a sheet or sheets of the re ired dimensions. As intimated above, while describing the figures of the drawing, a tube can be made out of a single sheet, or it may be com of a plurality of We shall spea first of its formation out of a single sheet or blank.

Taking a blank, as indicated by 15 in Fig. 1, which has been cut to size, we proceed to provide it with two series of corrugations 16 and 16 which series are offset with relation one to the other, but are joined together by means of an intervening series of diagonal deflections 17 the latter connecting all the corrugations in pairs from opposite sides of the blank. By preference, the several corrugations are made angular and pointed at both ends, as at 18. The function of the said deflections is to facilitate the folding of the blank and allow the thereto appertaining corrugations to be brought into parallelism, without weakening the metal when subjccted to the bending strain. In Figs. 3, 5, 6, and 8, are indicated a series of angularly disposed crimps 19 which result from the diagonal deflections 17, when the corrugated sheet metal or blank 15 is centrally bent and folded over. The said crimps or chain-like folds 19 provide means for taking up the surplus metal in the folding operation. Both the corrugations and deflections are conveniently produced by passing the metal sheet between rollers or dies of appropriate shape. Enough metal is left between the two series of corrugations 16 and 16", and also at the outer ends thereof, to provide for the making of two flanges 20 and 21, pres" ently to be described.

It is understood that the object in folding the blank on a central line, transversely of the corrugated sheet, and doubling it upon itself to bring its two series of corrugations into arallelism with each other, as aforesaid, 1S to form a continuous passage within and across the doubled sheet, such as the numeral 22 indicates in Figs. 6, 7, and 11. The passage 22, it will be-observed, is circuitous and formed by placing the offset corrugations one above another so that the inner angles of one series will come opposite the inner hollows of the other series,.and the converse. The opposite edges of the doubled sheet are kept suitably apart and ultimately connected in a well-known manner with receptacles filled with water or other fluid the flow whereof is directed transversely of the said corrugations, as before stated.

The blank havin been folded in the manner above indicat the outer ends thereof are brought together and interlocked as shown b the dotted lines 23 of Fig. 2, or the full lines 24 of Fig. 6, to form a seam or joint of well known construction-in the sheet metal workers art, and as an additional precaution to secure a tight seam the joined ends may be sweated or soldered together. Being firmly united one with the other, the said outer ends constitute a flange for the tube, which flange was reviously referred to as the flange 20, and 15 designed to stand forward when the tube is set up in its allotted place in the radiator or cooling apparatus. It should be noted that while the corrugations are struck up or otherwise formed in the blank, the metal sheet is kept from spreading at the ends, or else it is afterward restored to its original thickness if at all distended there atflrst; thus insuring to the flange a greater rigidity than is possessed by the expanded portions of the sheet. Consequently, the flange 20 operates to stiffen the tube, and it presents to the air a cutting edge, which has a natural tendency to promote a free circulation thereof through the straight and open horizontal passages intervening between adjacent tubes in the cooling apparatus, without in any way di minishin'g the normal space afforded for the circulation of water within the walls of the respective tubes. The crimps or chain folds 19 are preferably flattened out, as shown in Figs. 3, 6, and 8, thereby forming the aforesaid fiange 21, which, like the flange 20, is of greater thickness than the combined expanded sides of the blank or metal sheet 15, and similarly imparts to the tube a desirable amount of strength, stiffness, and rigidity. The flange 21 is made to stand at the rear of the tube when the latter occupies the position assigned to it in the radiator. thesaid flanges 20 and 21 are straight and designed to stand in the same plane, which is normal to the closed ends of the, two 'series of corrugations and bisects the tube centrally in the direction of its length, the plane touching successively the innermost angle of each corrugation on both sides of the tube, as the line 25 in Fig. 7 clearly indicates.

The entire series of steps above described as constituting our improved method or process is followed in manufacturing the tube represented by Figs. 8 and 9, the only difference that exists between the latter and theone shown in the preceding views being that the ends 26 of the corrugations are beveled off or made triangular in the modified form of tube. The same is true of the construction exemplified in Fig. 10, wherein the location 'of the seam to one side, instead of on a median line, of the tube constitutes the sole variation in the practice of the invention as hitherto explained.

In making the tube represented by Figs. 11 and 12, our invention is also applied in practically all its essential particulars, only the crimpin and folding of the blank are dispensed with, for the ver reason that this form of tube is not ma e from a single blank, but rather is composed of what may be termed two half-sheets of metal 15' and 15", brought together by superimposition. The two half-sheets or small sheets 15 and 15 are cbrrugated like the sheet 15 within suitable distance from their ends, they are Both.

superimposed so as to produce the same effect as the offsetting of the corrugations in the doubled sheet 15, their said ends being of the original thickness when united, and they are joined by sin le seams 24 and 24".

What we claim herein, and desire to secure by Letters Patent of the United States, is-

1. The herein-described method of making a radiator tube from a single sheet of metal, which consists in creasing the sheet to produce therein two series of corrugations that are offset relatively to one another, forming diagonal deflections therebetween, folding the sheet to bring the corrugations into parallelism, at a proper distance one from another and seaming the ends of the sheet.

2. Makingaradiator tube from a single sheet of metal, by forming in the metal sheet two series of corrugations offset relatively to one another, with diagonal connections between the said series, and folding 011 a median line to bring said corrugations into parallelism.

3. The herein-described method of making a radiator tube from sheet metal, which consists in corrugating the metal so as to leave a blank space at both ends of'each corrugation, bringing two series of such corrugations horizontally together in parallelism to form a vertical passage transversely thereof, closing the tube forward and rearward, and forming either end thereof into a flange normal to the paralleling horizontal corrugations.

Signed at the borough of Manhattan, in the county of New York and State of New York this 12th day of August, A. I). 1910.

EMIL BEHRINGER. HERMAN BEHRINGER. \Vitnesses ELEANOR T. MINOGUE, GEORGE Scnmrz. 

